There is a huge difference between living in this world, and living for this world.
Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him. For all that is in the world—the desires of the flesh and the desires of the eyes and pride of life [or pride of possessions] is not from the Father but is from the world. And the world is passing away along with its desires, but whoever does the will of God abides forever. 1John 2:15-17